package me.himi.love.view;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.CycleInterpolator;
import android.view.animation.TranslateAnimation;
import android.widget.EditText;

public class DeletableEditText extends EditText {
    private Drawable mRightDrawable;
    private boolean isHasFocus;

    public DeletableEditText(Context context) {
	super(context);
	init();
    }

    public DeletableEditText(Context context, AttributeSet attrs) {
	super(context, attrs);
	init();
    }

    public DeletableEditText(Context context, AttributeSet attrs, int defStyle) {
	super(context, attrs, defStyle);
	init();
    }

    private void init() {
	//getCompoundDrawables:
	//Returns drawables for the left, top, right, and bottom borders.
	Drawable[] drawables = this.getCompoundDrawables();

	//取得right位置的Drawable
	//即我们在布局文件中设置的android:drawableRight
	mRightDrawable = drawables[2];

	//设置焦点变化的监听
	this.setOnFocusChangeListener(new FocusChangeListenerImpl());
	//设置EditText文字变化的监听
	this.addTextChangedListener(new TextWatcherImpl());
	//初始化时让右边clean图标不可见
	setClearDrawableVisible(false);
    }

    /**
     * 当手指抬起的位置在clean的图标的区域
     * 我们将此视为进行清除操作
     * getWidth():得到控件的宽度
     * event.getX():抬起时的坐标(改坐标是相对于控件本身而言的)
     * getTotalPaddingRight():clean的图标左边缘至控件右边缘的距离
     * getPaddingRight():clean的图标右边缘至控件右边缘的距离
     * 于是:
     * getWidth() - getTotalPaddingRight()表示:
     * 控件左边到clean的图标左边缘的区域
     * getWidth() - getPaddingRight()表示:
     * 控件左边到clean的图标右边缘的区域
     * 所以这两者之间的区域刚好是clean的图标的区域
     */
    @Override
    public boolean onTouchEvent(MotionEvent event) {
	switch (event.getAction()) {
	case MotionEvent.ACTION_UP:

	    boolean isClean = (event.getX() > (getWidth() - getTotalPaddingRight())) && (event.getX() < (getWidth() - getPaddingRight()));
	    if (isClean) {
		setText("");
	    }
	    break;

	default:
	    break;
	}
	return super.onTouchEvent(event);
    }

    private class FocusChangeListenerImpl implements OnFocusChangeListener {
	@Override
	public void onFocusChange(View v, boolean hasFocus) {
	    isHasFocus = hasFocus;
	    if (isHasFocus) {
		boolean isVisible = getText().toString().length() >= 1;
		setClearDrawableVisible(isVisible);
	    } else {
		setClearDrawableVisible(false);
	    }
	}

    }

    //当输入结束后判断是否显示右边clean的图标
    private class TextWatcherImpl implements TextWatcher {
	@Override
	public void afterTextChanged(Editable s) {
	    boolean isVisible = getText().toString().length() >= 1;
	    setClearDrawableVisible(isVisible);
	}

	@Override
	public void beforeTextChanged(CharSequence s, int start, int count, int after) {

	}

	@Override
	public void onTextChanged(CharSequence s, int start, int before, int count) {

	}

    }

    //隐藏或者显示右边clean的图标
    protected void setClearDrawableVisible(boolean isVisible) {
	Drawable rightDrawable;
	if (isVisible) {
	    rightDrawable = mRightDrawable;
	} else {
	    rightDrawable = null;
	}
	//使用代码设置该控件left, top, right, and bottom处的图标
	setCompoundDrawables(getCompoundDrawables()[0], getCompoundDrawables()[1], rightDrawable, getCompoundDrawables()[3]);
    }

    // 显示一个动画,以提示用户输入
    public void setShakeAnimation() {
	this.startAnimation(shakeAnimation(5));

    }

    //CycleTimes动画重复的次数
    public Animation shakeAnimation(int CycleTimes) {
	Animation translateAnimation = new TranslateAnimation(0, 10, 0, 10);
	translateAnimation.setInterpolator(new CycleInterpolator(CycleTimes));
	translateAnimation.setDuration(1000);
	return translateAnimation;
    }
}
